can someone name one successful startup that actually utilizes the blockchain to do something they couldnt have done without?
It is a decentralized name registry that maps domain names to public keys and IP addresses, removing the need for Certificate Authorities and resolving Zooko's triangle [1].
I do agree that blockchain is insanely over-hyped, has very few real use-cases and mostly used as a PR tool in ways that makes no sense. Sound money and cryptographic identity registries are among the only reasonable use-cases that I can name.